68k

68000
Information, photos of many 68k chips, including second source makers. [cpu-collection.de]
http://www.cpu-collection.de/?tn=1&l0=cl&l1=68000

ColdFire Development Resources
Source code for a GCC variant, with optimizations, bug fixes for Freescale Semiconductor (Motorola) variable length RISC 68K series processors; information on how to use GNU C, RTEMS, and other free tools for embedded development.
http://sca.uwaterloo.ca/coldfire/gcc-doc/docs.htm

comp.sys.m68k Frequently Asked Questions
Information on many 68k members.
http://www.esacademy.com/automation/faq/m68k/

68k
Growing article, with links to many related topics. [Wikipedia]
http://en.wikipedia.org/wiki/68k

68K/ColdFire
Makes and sells 68k processors. Includes, varied information: documents, datasheets, product selector, tools, design, fora, FAQs, success stories, links. [Freescale Semiconductor, Inc.]
http://www.freescale.com/webapp/sps/site/homepage.jsp?nodeId=0162468rH3YTLC

Motorola 68000
Growing article, with links to many related topics. [Wikipedia]
http://en.wikipedia.org/wiki/Motorola_68000